.container {
    width: 50vw;
    margin: 10vh auto 0;
}
.app {
    min-height: 200px;
    border: 2px dotted #ff6400;
    padding: 4px;
    outline: none;
}

.tools {
    border-width: 2px 2px 0 2px;
    border-color: #ff6400;
    border-style: dotted;
    padding: 4px;
}

.tools strong {
    margin-right: 16px;
    font-size: 16px;
    color: #999;
    cursor: pointer;
}
.tools strong:hover {
    color: black;
}